US4812290A
Expired / Lapsed
US
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Third element additions to aluminum-titanium master alloys
Assignee: KB Alloys Inc
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Filing: 1986-09-08
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Granted: 1989-03-14
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Expires: 2006-09-08
Abstract
Abstract Provided is an improved aluminum-titanium master alloy containing carbon in a small but effective content and not more than about 0.1%. After melting, the master alloy is superheated to about 1200°-1250° C. to put the carbon into solution, then the alloy is cast in a workable form. The master alloy in final form is substantially free of carbides greater than about 5 microns in diameter. The alloy of this invention is used to refine aluminum products that may be rolled into thin sheet, foil, or fine wire and the like.
Inventors
- 👤 Geoffrey K. Sigworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:53
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/02; C22C1/03
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
121 words
A method of making an Al-Ti-C master alloy comprising of steps of: preparing an alloy of Al-Ti-C at a temperature below about 1150° C. consisting essentially of, in weight percent, carbon up to 0.1, titanium 2 to 15, and the balance aluminum plus impurities normally found in master alloys; superheating the alloy to a temperature above about 1150° C. for a time sufficient to place the carbon into solution in the alloy; and casting the alloy to produce a master alloy consisting essentially of, in weight percent, carbon up to 0.1, titanium 2 to 15, and the balance aluminum plus impurities normally found in master alloys, wherein the alloy is substantially free of carbides greater than about 5 microns in diameter.
Claim 2
Independent Claim
121 words
A method of making an Al-Ti-C master alloy comprising of steps of: preparing an alloy of Al-Ti-C at a temperature below about 1150° C. consisting essentially of, in weight percent, carbon up to 0.1, titanium 2 to 15, and the balance aluminum plus impurities normally found in master alloys; superheating the alloy to a temperature above about 1150° C. for a time sufficient to place the carbon into solution in the alloy; and casting the alloy to produce a master alloy consisting essentially of, in weight percent, carbon up to 0.1, titanium 2 to 15, and the balance aluminum plus impurities normally found in master alloys, wherein the alloy is substantially free of carbides greater than about 5 microns in diameter.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the alloy is prepared by adding carbon and titanium to a melt of aluminum.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein the carbon comprises a metal carbide.
Claim 5
Dependent Claim
14 words
The method of claim 2 wherein the carbon comprises powdered graphite or carbon black.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein the alloy is superheated to a temperature from about 1200° C. to about 1250° C.
Claim 7
Dependent Claim
16 words
The method of claim 1 wherein the alloy is superheated for at least about 5 minutes.
Claim 8
Dependent Claim
21 words
The method of claim 1 wherein the alloy is superheated in an inert crucible substantially free of carbon and its intermetallics.
Claim 9
Dependent Claim
18 words
The method of claim 7 wherein the crucible is composed of aluminum oxide, beryllium oxide, or magnesium oxide.
Claim 10
Independent Claim
148 words
A method of making an Al-Ti-C master alloy comprising the steps of: preparing an alloy of Al-Ti-C consisting essentially of, in weight percent, carbon greater than 0.003 but less than 0.1, titanium 2 to 15, and the balance aluminum plus impurities normally found in master alloys by adding the carbon and the titanium to a melt of the aluminum at a temperature below 1150° C.; superheating the alloy to a temperature between about 1200° C. and 1250° C. for at least about 5 minutes in an inert crucible substantially free of carbon and its intermetallics; and casting the alloy to produce a master alloy consisting essentially of, in weight percent, carbon greater than 0.003 but less than 0.1, titanium 2 to 15, and the balance aluminum plus impurities normally found in master alloys, wherein the alloy is substantially free of carbides greater than about 5 microns in diameter.
Claim 11
Independent Claim
148 words
A method of making an Al-Ti-C master alloy comprising the steps of: preparing an alloy of Al-Ti-C consisting essentially of, in weight percent, carbon greater than 0.003 but less than 0.1, titanium 2 to 15, and the balance aluminum plus impurities normally found in master alloys by adding the carbon and the titanium to a melt of the aluminum at a temperature below 1150° C.; superheating the alloy to a temperature between about 1200° C. and 1250° C. for at least about 5 minutes in an inert crucible substantially free of carbon and its intermetallics; and casting the alloy to produce a master alloy consisting essentially of, in weight percent, carbon greater than 0.003 but less than 0.1, titanium 2 to 15, and the balance aluminum plus impurities normally found in master alloys, wherein the alloy is substantially free of carbides greater than about 5 microns in diameter.
Claim 12
Dependent Claim
10 words
The master alloy produced by the method of claim 1.
Claim 13
Dependent Claim
10 words
The master alloy produced by the method of claim 5.
Claim 14
Dependent Claim
10 words
The master alloy produced by the method of claim 7.
Claim 15
Dependent Claim
10 words
The master alloy produced by the method of claim 9.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |